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Brainteasers

Age 8-12

All in code

Each letter in this addition stands for a different digit.

AAA

BBB

+ CCC

BAAC

What digit does each letter represent?

Age 11-14

Swimming race

Lisa can swim 100 metres in 84 seconds.

Sarah can swim 100 metres in 87.5 seconds.

How many metres start must Lisa give Sarah so that they finish the race at exactly the same time?

999

111

+ 888

- --

1998

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